| The great width of the rivers allowed the development of flatbottomed boats capable of carrying hundreds of tons of cargo. |
| Its capacity rating was 150 tons per hour, but its actual maximum capacity was 200 tons per hour. |
| Worldwide, about 1200 million tons of fixed nitrogen circulates annually between growth and decomposition primarily with the decomposer bacteria. |
| Twelve wagons were loaded with stones, till each wagon weighed three tons, and the wagons were fastened together. |
| These huge stones, ten uprights and five lintels, weigh up to 50 tons each. |
| Thus the brand-new caravel which took Cadamosto to Senegambia in 1455 was a vessel of some fifty-four tons capacity. |
